The SPIN Nylon Cables for Interchangeable knitting needle tips work with both the SPIN and TWIST ChiaoGoo tips. PLEASE NOTE: Stock is limited as these are being discontinued. If you have a specific need, please call or email and we will see if we can get extra. These Cords are made of clear, pliable, nylon For Tip sizes US 2-8 use the Small join cables For Tip sizes US 9-15 use the Large join cables The 8" cord length can be used with the 4" tips to make a 16" circular needle. The length listed is the actual length of the cable so if you have 4" tips add 8 inches, and if you have 5" tips add 10 inches, to the cable length to get the total length of the circular needle The cords include a lifeline hole and range in size from 8 inches to 50 inches. You may also be interested in accessories here.